Not sure why but I received an email from Microsoft with the title "There's $4 in this email. And the start of your next adventure." I'm sure this is YMMV but if one other person can score some free credit then it's worth it. Have a good one.
You just scored $4 to Microsoft Store. You can use it toward that new game, add‑on, or movie you've been waiting to get. That was lucky. Now all that's left is having fun.
Promotional one-time-use gift code valid for named recipient of this email in the United States. PROMOTIONAL CODE MUST BE REDEEMED BY 3/31/2019, AND PROMOTIONAL GIFT CODE MUST BE SPENT WITHIN 90 DAYS OF REDEMPTION OR BY 3/31/2019, WHICHEVER COMES FIRST. Promotional gift code offer is nontransferable and not redeemable for cash. Limit: one (1) free gift code per person. Use the code for eligible purchases (exclusions apply) at select Microsoft Stores and other participating Microsoft online stores. You must be age 13 and older. Subject to gift card terms at www.microsoft.com/giftcard
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